l波段大功率小型化同轴-共面波导型定向耦合器设计

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1、摘要3．加工了小型化定向耦合器及相应的转换接头，利用矢量网络分析仪测试了低功率下耦合器的特性参数；结合同轴馈电天线及检波组件等器件搭建了小型化的L波段高功率微波辐射场测量系统，在大功率微波辐射场中与传统波导型测量系统进行了比对实验，验证了小型化测量系统的功率容量。实验结果表明，设计所得定向耦合器在1GHz~2GHz范围内端口驻波小于1.2，耦合度约为47dB，带内平坦度约为2dB，方向性大于17dB，其功率容量不小于1.4MW，能够满足L波段高功率微波辐射场测量需要；且该定向耦合器体积为150mm46mm55mm，仅为同频段波导型耦

2、合器体积的十分之一，实现了L波段大功率定向耦合器的小型化设计。关键词：高功率微波，定向耦合器，L波段，CPW传输线，菱形缝隙II万方数据ABSTRACTABSTRACTTheHPM(highpowermicrowave)radiationfieldmeasurementisoneofthefundamentalresearchesofHPMtechnology,anditisanimportantmeanstoestimatetheproperpropertyandtheradiationfieldeffectofHPMsystem.A

3、normalHPMradiationfieldmeasurementsystemiscomposedofreceivingantenna,attenuationpart,detectorpartandetc.ConsideringthattheHPMradiationfieldhasacharacteristicofhighpeakpower,sotheantennaandattenuationpartsusuallyselectthewaveguidedevices,whichhavehighpowercapacity.ButforL

4、-bandmicrowaveapplications,thesizeofthewaveguidecomponentsiscomparativelylarge,andthecomposedradiationfieldmeasurementsystemhaslargesizeandisheavy,whicharenotsuitableforusing.Theeffectbetweentwomeasurementsystemsconstraintsthenumberofelementsthatcouldbeusedduringthepower

5、measurementbyarraymethod,thatincreasestheintegralerroranddecreasestheradiationfieldmeasurementaccuracy.SothestudyonminiaturizationofmeasurementsystemforL-bandHPMradiationfieldmeasurementissignificant.Toresolvetheproblemsmentionedabove,astudyonaminiatureL-bandhigh-powerdi

6、rectionalcouplerisproposed.1.Onthebasicofwidelysurvey,researchstatusaboutdirectionalcouplerwasanalyzedandthefactorsaffectthecouplerdesignwereconcluded,thosewerepowerhandlingcapacity,frequencyrangeandthesize.Thedesignprincipleaboutminiaturizationisdecreasingthecross-secti

7、onareaofthecouplerundertheconditionofensuringthepowerhandlingcapacityandshorteningthelengthofthecouplerundertheconditionofexpandingthefrequencyrange.Onthisprinciple,thestructureoftheminiatureL-bandhigh-powerdirectionalcouplerwasconfirmed.Acircularrectangularline(C-Rcoaxi

8、alline)withpropersizewasusedasthedirectionalcoupler’smainlinetomakesurethecouplerhashighpowerhandlingca